Oil & Gas
| Wed 15 Apr 2026
Beijing, April 16 -- Daqing Oilfield and PetroChina have submitted a patent application for Visual Sand-filled Pipe Oil Displacement Experimental Device. This invention was developed by Song Yuhua, Wang Baojiang, Wu Zanxiao, Gao Feng, Shi Qingbin, Lin Shiying, Li Yan, Li Jun, Liu Shuang and Lu Jiping.
The patent application n..